1. BY : SYARIFATUL MUFLIKHAH
STATISTIKA DASAR
BY : SYARIFATUL MUFLIKHAH

2. Because of staffing decisions, managers of the gibson-marimont hotel are interested in the variability in the number of rooms occupied per day during a particular season of the year. a sample of 20 days of operation shows a sample mean of 290 rooms occupied per day and a sample standard deviation of 30 rooms.
a.) what is the point estimate of the population variance?
b.) provide a 90% confidence interval estimate of the population variance ?
c.) provide a 90% confidence interval estimate of the population standard deviation.

3. JAWAB :

4. b.) Estimasi interval kepercayaan untuk variansi populasi adalah:

5. c.) Estimasi interval kepercayaan untuk standard deviasi populasi adalah :